Bar-Ilan Combinatorics Seminar The next meeting of the seminar will take place, IYH, (when) Sunday, 23 Nisan (Apr. 15), 14:00-15:30 (right after Pesach) (where) Room 201 (Math & CS Seminar Room), Building 216, Bar-Ilan University (who) Moshe Cohen (Bar-Ilan University) (what) The width of the perfect matching graph for knots Abstract: A knot is a circle embedded in three-space, but we immediately translate it into a bipartite graph Gamma following previous work of the author. We consider the graph G of perfect matchings of this graph Gamma, providing a combinatorial formula for the width of G. We present several properties of Gamma and construct a partition of its vertices into cycles that relate directly to G. This work was inspired by a seminar talk by Roy Ben-Ari on part of his Masters thesis under the supervision of Ron Adin and Yuval Roichman. This is joint work with Mina Teicher. ************************************************************************* You are all invited! Graduate students are especially welcome. Seminar organizer: Ron Adin <radin@math.biu.ac.il> Seminar's homepage: <http://www.math.biu.ac.il/~radin/comsem/comsem.html> ************************************************************************* Technion Math Net-2 (TECHMATH2) Editor: Michael Cwikel <techm@math.technion.ac.il> Announcement from: Ron Adin <radin@math.biu.ac.il>